feat(cpp-object-oriented-modular-refactoring): step 19 - boundary-condition-policy

2026-08-16 11:23:20 +09:00
parent f26e0a61a8
commit 64a43948ef
27 changed files with 919 additions and 365 deletions
@@ -0,0 +1,43 @@
+#ifndef FESA_CONSTRAINTS_ESSENTIAL_CONSTRAINT_POLICY_H_
+#define FESA_CONSTRAINTS_ESSENTIAL_CONSTRAINT_POLICY_H_
+
+#include "fesa/core/status.h"
+#include "fesa/math/sparse_matrix.h"
+#include "fesa/math/vector.h"
+
+namespace fesa {
+
+class DofManager;
+
+/// @brief Stores full-stiffness blocks in stable free/constrained order.
+struct PartitionedStiffness {
+  SparseMatrix k_ff;
+  SparseMatrix k_fc;
+  SparseMatrix k_cf;
+  SparseMatrix k_cc;
+};
+
+/// @brief Applies stable prescribed-displacement elimination.
+class EssentialConstraintPolicy {
+ public:
+  /// @brief Partitions full stiffness into Kff, Kfc, Kcf, and Kcc.
+  Result<PartitionedStiffness> Partition(const SparseMatrix& full_stiffness,
+                                         const DofManager& dof_manager) const;
+
+  /// @brief Gathers a full vector in stable free-equation order.
+  Vector GatherFree(const Vector& full_values,
+                    const DofManager& dof_manager) const;
+
+  /// @brief Gathers a full vector in stable constrained-DOF order.
+  Vector GatherConstrained(const Vector& full_values,
+                           const DofManager& dof_manager) const;
+
+  /// @brief Reconstructs full d from stable df and exact prescribed dc.
+  Vector ReconstructFull(const Vector& free_values,
+                         const Vector& constrained_values,
+                         const DofManager& dof_manager) const;
+};
+
+}  // namespace fesa
+
+#endif  // FESA_CONSTRAINTS_ESSENTIAL_CONSTRAINT_POLICY_H_